Features: The EasyDriver is a simple to use stepper motor driver, suitable for anything that can output a digital 0 to 5V pulse (or 0 to 3.30V pulse if you solder SJ2 closed on the EasyDriver). EasyDriver requires a 7V to 30V supply to power the motor and can power any voltages of stepper motor. The EasyDriver have on board voltages regulator for the digital interfaces that can be set to 5V or 3.30V. Connect a 4-wire stepper motor and a microcontroller and you have motor control. On this version we fixed the silk error on adjustment. The microstep select MS2 pin of the A3967 is broken out allowing adjustments to the microstepping resolution. The sleep and enable pin is also broken out for control.cjmcu. Do not connect or disconnection a motor while driver is energizes. This will cause permanent damage to the A3967 IC. Specifications: Component:PCB Size:Approx.48mm/1.88inch Package Includes: 2Pcs Stepper Motor Driver Board note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.